TW201112595A - Controller chip and protection method for a power converter - Google Patents

Controller chip and protection method for a power converter Download PDF

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Publication number
TW201112595A
TW201112595A TW98131889A TW98131889A TW201112595A TW 201112595 A TW201112595 A TW 201112595A TW 98131889 A TW98131889 A TW 98131889A TW 98131889 A TW98131889 A TW 98131889A TW 201112595 A TW201112595 A TW 201112595A
Authority
TW
Taiwan
Prior art keywords
voltage
jfet
source
controller chip
power
Prior art date
Application number
TW98131889A
Other languages
Chinese (zh)
Other versions
TWI393333B (en
Inventor
Kuo-Chin Chiu
Chih-Feng Huang
Original Assignee
Richpower Microelectronics
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Richpower Microelectronics filed Critical Richpower Microelectronics
Priority to TW98131889A priority Critical patent/TWI393333B/en
Publication of TW201112595A publication Critical patent/TW201112595A/en
Application granted granted Critical
Publication of TWI393333B publication Critical patent/TWI393333B/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/36Means for starting or stopping converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection

Abstract

A controller chip and protection method for a power converter use a high voltage start-up element in the controller chip to implement protection functions without requiring additional pins and external elements of the controller chip. A JFET as a high voltage start-up element is connected between a high voltage pin and a power input pin of the controller chip to charge a power capacitor connected to the power input pin at power on, and the controller chip monitors the voltage at the power input pin to turn off the JFET once the voltage at the power input pin reaches a threshold value. Thereafter, the source voltage of the JFET will reflect the voltage at the high voltage pin, and a protection circuit monitors the source voltage of the JFET to determine a protection signal.

Description

201112595 VI. Description of the Invention: [Technical Field] The present invention relates to a power converter, and more particularly to a controller chip and a protection method for a power converter. [Prior Art] FIG. 1 is a conventional AC-to-DC power converter in which a parent-current power VAC of a power supply converter is subjected to wave-wave and rectification to obtain a DC voltage vdc, which is applied to a primary-side coil Lp of a transformer T1, and a controller The driver 18 in the wafer 10 supplies a control signal Vgate to switch the power switch Q1 to convert the voltage VDC on the primary side coil Lp to an output voltage v〇. The high voltage starting element 16 in the controller wafer 10 is connected between the high voltage pin HV and the power pin VDD to activate the controller chip 10 when the AC voltage VAC is just supplied to the power converter. After the controller wafer 10 is activated, the auxiliary winding Laux generates a current to charge the power supply capacitor C1 via the resistor R1 and the diode D1, thereby supplying power to the controller wafer 10. In the AC-to-DC power converter, in order to avoid an unread operation of the load circuit due to a low DC voltage VDC, a low-voltage state detector 12 is provided to monitor the DC voltage VDC. The low voltage state detector 12 includes resistors R2, R3, R4 and a hysteresis comparator μ. The resistors R2, R3 and R4 divide the DC voltage VDC to generate a voltage V1, and the hysteresis comparator 14 compares the voltage VI and the threshold Vref to determine the protection signal Sc, thereby turning the driver 18 on or off. The low voltage state detector 12 requires external resistors R2, R3 and R4, and the controller wafer 10 needs to be provided with additional pins εν, thus increasing cost. The low voltage state detector 12 also causes current to flow to the ground via resistors R2, 201112595 R3 and R4, resulting in energy consumption. SUMMARY OF THE INVENTION One object of the present invention is to provide a controller wafer of a power converter. One of the objects of the present invention is to provide a method of protecting a power converter. According to the present invention, a controller chip of a power converter includes a high voltage connection

Foot, power pin and junction field effect transistor (juncti〇n Fieid Effect

Transistor; JFET) as a high voltage starting component, the jpet has a drain connected to the high voltage pin, the diode has an anode connected to the source of the JFET and a cathode connected to the gate of the JFET transistor and the power pin, the circuit connection The JFET's miscellaneous 'monitoring the hybrid voltage to the mosquito, and the voltage at which the device is connected to the electrical foot's power supply pin determines the side signal for switching the JFET. According to the present invention, the method of converting H is included in the power supply selection process: when the power supply capacity is (4) when the pressure is reached to the boundary value, and in the lungs, the drum is used. The pole voltage determines the protection signal. Since the controller chip is used to realize the circuit name function from the original pressure-starting component of the _Guang, At, it is not necessary to increase the smashing smash. „I 制 曰 的 的 及 及 外部 外部 电源 电源 电源 电源 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器 控制器In the wafer 2, the crucible 24 as the armor starting element 22 has a drain connection high voltage pin HV, the pole body Dh has a source connected to the anode of the jpET 24, and the cathode is connected to the gate of the IFET 24 via a current limiting resistor. The cathode of the body Dh is also connected to the power pin VDD, the switch ST is connected between the gate of the JFET 24 and the ground GND, and the detector 26 detects the voltage of the power pin VDD and determines the detection signal S1 for switching. Switch ST, protection circuit 28 monitors the source voltage JS of JFET 24 to determine the protection signal. Protection circuit 28 includes low voltage state detector 30 and overvoltage guard detector 34. Low voltage state detector 3〇 has hysteresis comparison The device 32 compares the voltage JS with the low voltage threshold vref1 to determine the low voltage protection signal BN〇 for activating or deactivating the driver 18. The overvoltage protection detector 34 has a hysteresis comparator 36 comparing the voltage JS and the overvoltage threshold Vref2. Overvoltage protection letter 〇Vp is given to driver 18. Since the characteristics of JFET 24 are modulated, its threshold voltage Vth is closely related to its gate voltage VDC, and Figure 3 is a characteristic curve between the two. Referring to Figures 2 and 3, When the power is turned on, the voltage of the gate and the source of the AC voltage VAC just supplied to the power converter 'JFET 24 is equal or nearly equal, so the JFET 24 is turned on, and the current is passed through the JFET 24, the diode Dh, and the power pin. VDD charges the power capacitor C1. The detector 26 detects the voltage VDD on the power capacitor C1. For example, the comparator 38 compares the voltage vDD with the threshold UVLO. When the voltage VDD reaches the UVLO, the detector 26 triggers the detection signal. No. 81 and open (>1111〇11) switch 8 butyl, so the gate voltage JG of £4 is pulled to 0V, so that the JFET 24 is turned off, that is, the current is no longer turned on, so energy can be saved. Since the voltage 201112595 VDD on the power supply capacitor C1 is sufficient to start the controller chip 20 at this time, the driver 18 is activated to generate the control signal Vgate to switch the power switch Q1, thereby starting the power required by the auxiliary coil Laux to supply the controller chip 20. this The startup of the power converter is completed. After the power converter is started, the gate voltage JG of the JFET 24 is 0V, and the voltage of the power pin VDD is greater than the threshold value UVL〇, so the source voltage JS of the jpET24 will be locked in the jpet 24 The threshold voltage Vth is as shown in Fig. 3. ^ When the DC voltage VDC changes, the threshold voltage Vth of the JFET 24 will also change, so the low voltage state detector 30 can determine the DC voltage vdc by detecting the source voltage JS of the JFET 24. Is it too low? Assume that the starting voltage (brown_in) is at a level of 114V' and the low-voltage state (brown_out) is at a level of ιοον. From Fig. 3, the voltage JS is about 1.2V when the voltage VDC is 114V, and the voltage JS is about l when the voltage VDC is 100V. Iv, therefore, when the hysteresis comparator 32 in the low-voltage state detector 3〇 detects that the voltage jS is greater than uv, the driver 18 can operate normally. When the hysteresis comparator 32 detects that the voltage JS is less than 1.iv, The φ is connected to the low voltage protection signal BNO to turn off the driver 18. Similarly, the overvoltage protection detection 34 can also determine whether the voltage vdc is too high by detecting the voltage js. Assuming that the level of the overvoltage is set to 400V, as can be seen from FIG. 3, the voltage JS is about 4.4V when the voltage VDC is 400V, so when the hysteresis comparator 36 in the overvoltage protection detector 34 detects that the voltage JS is greater than At 4.4V, the overvoltage protection signal OVP will be triggered to turn off the driver circuit 18. In the present embodiment, although only the low voltage state protection and the overvoltage protection are taken as an example, it is also possible to achieve other protection by detecting the gate voltage JS of the JFET 24, for example, overload protection compensation. In this embodiment, the controller chip 2 监视 monitors the DC voltage VDC by using the high 201112595 crimping pin HV to achieve protection. In other embodiments, the protection can be achieved by monitoring the AC voltage VAC or the drain voltage of the power switch Q1. . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conventional AC-to-DC power converter; FIG. 2 is an embodiment of the present invention; and FIG. 3 is a characteristic curve between a gate voltage and a threshold voltage of a JFET. [Main component symbol description] 10 Controller chip 12 Low voltage state detector 14 Hysteresis comparator 16 High voltage starting element 18 Driver 20 Controller chip 22 High voltage starting element 24 JFET 26 Detector 28 Protection circuit 30 Low voltage state detection 32 hysteresis comparator 34 overvoltage protection detector 36 hysteresis comparator 201112595

Claims (1)

  1. 201112595 VII, the scope of application for patents: L - controller chip of power converter, including: high voltage pin; JFET of high voltage starting component, with nuclear pole connected to the high voltage connection; - power pin; diode, with An anode is connected to the source of the JFET and the cathode is connected to the gate of the JFET and the power pin; a bias circuit is connected to the source of the lung T, detecting the source voltage to trigger the erroneous signal; and the detector connection The power pin detects the voltage of the power pin to trigger a detection signal for switching the JFET. 2. The controller chip of claim 1, wherein the protection circuit includes a low voltage state detector coupled to the source of the JFET, the source voltage being sensed to trigger the protection signal. 3. The controller chip of claim 2, wherein the low voltage state detector comprises a magnetic φ '/the sense comparator is connected to the source of the JFET, and the source voltage and the low voltage threshold are compared. 4. The controller chip of claim 1, wherein the protection circuit includes an overvoltage protection detector connected to the source of the JFET, and the source voltage is sensed to trigger the protection 'signal. 5. The controller chip of claim 4, wherein the overvoltage protection detector includes a hysteresis comparator coupled to the source of the JFET, and comparing the source voltage and the overvoltage threshold. 6. The controller chip of claim 1, wherein the detector comprises a comparator connection 201112595. The power pin compares the voltage and the threshold of the power pin. 7. The controller chip of claim 1, further comprising a switch connected between the gate and the ground of the JFET, controlled by the detection signal. 8. The controller chip of claim 1, further comprising a resistor connected between the gate and the source of the jpET. 9. A method of protecting a power converter, comprising the steps of: (A) charging a power capacitor via jpET when the power is turned on;
    (B) detecting the voltage on the power supply capacitor; (C) turning off the scare when the voltage on the j power supply valley reaches a critical value; and (D) monitoring the source voltage of the jpet after the JFET is turned off to determine Protection signal. ~ 10. For the protection method of claim 9, the step c includes grounding the JpET ground when the voltage on the power supply capacitor reaches a critical value. 11. For the protection method of the handle 9, the step D includes the source voltage and the low voltage threshold of the JFET. 12. The method of claim 9, wherein the step D comprises comparing a source voltage and an overvoltage threshold of the J-voyage. 13. The method of claim 9, wherein the threshold voltage of the JFET is changed with the voltage of the gate.
TW98131889A 2009-09-22 2009-09-22 Controller chip and protection method for a power converter TWI393333B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW98131889A TWI393333B (en) 2009-09-22 2009-09-22 Controller chip and protection method for a power converter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW98131889A TWI393333B (en) 2009-09-22 2009-09-22 Controller chip and protection method for a power converter
US12/884,688 US20110069420A1 (en) 2009-09-22 2010-09-17 Protection to a power converter by using a high-voltage start-up device in a controller chip of the power converter

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TW201112595A true TW201112595A (en) 2011-04-01
TWI393333B TWI393333B (en) 2013-04-11

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TWI465014B (en) * 2012-09-21 2014-12-11
TWI470910B (en) * 2011-05-18 2015-01-21 Delta Electronics Inc A method for protecting a converter and a converter

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US9520767B2 (en) * 2011-09-13 2016-12-13 Fairchild (Taiwan) Corporation Protection circuit for power converter
JP5935535B2 (en) * 2012-06-20 2016-06-15 富士電機株式会社 Abnormal voltage detector
US9071157B2 (en) * 2013-06-21 2015-06-30 Sync Power Corporation High-voltage (HV) startup device
KR102059204B1 (en) * 2013-06-28 2020-02-10 매그나칩 반도체 유한회사 Apparatus for Switching Mode Power Supply detecting the AC-off status
TWI502866B (en) * 2013-10-29 2015-10-01 Richtek Technology Corp Soft start switching power converter means
WO2015066221A1 (en) * 2013-10-31 2015-05-07 Dialog Semiconductor Inc. Power converter with dynamic preload
US20150116013A1 (en) * 2013-10-31 2015-04-30 Samsung Electro-Mechanics Co., Ltd. Integrated circuit
CN104868764B (en) * 2014-02-26 2017-08-04 全汉企业股份有限公司 Inverter and its power conversion method
CN105652074B (en) 2014-12-03 2018-08-10 万国半导体(开曼)股份有限公司 Voltage detecting circuit and the method for detecting voltage change
CN105720807B (en) 2014-12-03 2018-05-29 万国半导体(开曼)股份有限公司 It is detained the method and device of voltage for detecting input voltage and releasing
CN105759135B (en) 2014-12-17 2018-11-13 万国半导体(开曼)股份有限公司 The circuit and method of load condition are judged in flyback converter
CN105763061B (en) 2014-12-17 2018-05-29 万国半导体(开曼)股份有限公司 Flyback converter output current counting circuit and computational methods
CN105763030B (en) 2014-12-17 2018-07-13 万国半导体(开曼)股份有限公司 In the circuit and method that electric pressure converter startup stage inhibits electric current excessive
US10153702B2 (en) * 2017-02-07 2018-12-11 Infineon Technologies Austria Ag Switched-mode power supply controller using a single pin for both input voltage sensing and control of power supply charging
US10256630B2 (en) * 2017-05-30 2019-04-09 Infineon Technologies Austria Ag Controller device for power electronics circuit

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TWI465014B (en) * 2012-09-21 2014-12-11

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US20110069420A1 (en) 2011-03-24

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